US4448123A - Variable speed printing for dot matrix printers - Google Patents

Variable speed printing for dot matrix printers Download PDF

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Publication number
US4448123A
US4448123A US06/394,054 US39405482A US4448123A US 4448123 A US4448123 A US 4448123A US 39405482 A US39405482 A US 39405482A US 4448123 A US4448123 A US 4448123A
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US
United States
Prior art keywords
state
dot
data
printing
print
Prior art date
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Expired - Lifetime
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US06/394,054
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English (en)
Inventor
Arthur E. Fleek
Samuel C. Tseng
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International Business Machines Corp
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International Business Machines Corp
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Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US06/394,054 priority Critical patent/US4448123A/en
Assigned to INTERNATIONAL BUSINESS MACHINES CORPORATION, A CORP. OF NY reassignment INTERNATIONAL BUSINESS MACHINES CORPORATION, A CORP. OF NY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FLEEK, ARTHUR E., TSENG, SAMUEL CHIN-CHONG
Priority to EP83100690A priority patent/EP0097757B1/en
Priority to AT83100690T priority patent/ATE33466T1/de
Priority to DE8383100690T priority patent/DE3376258D1/de
Priority to ZA831056A priority patent/ZA831056B/xx
Priority to IE368/83A priority patent/IE54176B1/en
Priority to CA000425599A priority patent/CA1186946A/en
Priority to JP58068529A priority patent/JPS599064A/ja
Priority to AU13851/83A priority patent/AU558569B2/en
Priority to ES522306A priority patent/ES522306A0/es
Priority to BR8303231A priority patent/BR8303231A/pt
Publication of US4448123A publication Critical patent/US4448123A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/10—Hammers; Arrangements thereof of more than one hammer, e.g. one for each character position
    • B41J9/12—Hammers; Arrangements thereof of more than one hammer, e.g. one for each character position each operating in more than one character position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/31—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using a print element with projections on its surface impacted or impressed by hammers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/44—Control for hammer-impression mechanisms

Definitions

  • This invention relates to impact matrix printing and, more particularly, to a printer apparatus operable at higher rates of speed.
  • a variety of dot matrix printers are known in the prior art. The development of these printers has progressed to a level at which high printing speeds can be achieved. However, in general, these printers go through a set mode of operation to print a line of characters so that their printing rate is constant regardless of the data to be printed.
  • a dot matrix printer in which means are provided for monitoring the state of the pattern data to be printed.
  • the monitoring means includes a plurality of devices capable of being set into either of two states, and the devices are set to one state at the beginning of a printing operation.
  • the groups of pattern data to be printed are accessed in the direction the data is to be printed starting at the first print position, and the state of one device in the monitoring means is changed to the state opposite the one state as each of the groups of data are accessed.
  • the data is accessed in a direction opposite to the direction the data is to be printed starting at the last print position, and the state of one of the devices in the monitoring means is changed for each group of pattern data sensed of a second state prior to sensing one group of data having a first state.
  • Means are provided for sensing when the number of devices of the monitoring means set to the state opposite the one state reaches a reference level to indicate to the printer that all the data for that dot line has been printed.
  • the monitoring means comprises a counter into which a predetermined count is set at the beginning of a printing operation.
  • the count in the counter is decremented by one count.
  • the count in the counter is decremented one count. The count in the counter is sensed after each change and, when the count reaches a reference level such as zero, a signal is generated which indicates to the printer that the dot print line is complete.
  • the monitoring means comprises a Random Access Memory (RAM) which has a number of storage locations initially set to a first state.
  • the storage locations are set to the state opposite the first state as the data groups are accessed, as previously described.
  • the state of the memory locations is sensed and, when the number of storage locations in the state opposite the first state reaches a reference level, a signal is generated which signifys to the printer that the dot print line is complete.
  • RAM Random Access Memory
  • FIG. 1 shows the primary functional elements of a preferred embodiment of a printer to which the invention is applicable
  • FIG. 2 shows the arrangement of dot band elements relative to the hammer faces in the printer to which the invention is applicable
  • FIG. 3 is a diagram illustrating the manner in which pattern data to be printed is processed and presented to the control circuits of the printer shown in FIGS. 1 and 2;
  • FIG. 4 is a block diagram of a specific embodiment of circuitry for controlling the variable speed printing operation according to the present invention for a printer such as that shown in FIGS. 1 and 2;
  • FIG. 5 is a block diagram of an alternate embodiment of circuitry for controlling the variable speed printing operation according to the present invention for a printer such as that shown in FIGS. 1 and 2;
  • FIG. 6 is a block diagram of a part of the control signals generated by the forward scan logic
  • FIG. 7 is a block diagram of a part of the control signals generated by the backward scan logic.
  • the present invention relates to variable speed printing which enables a specific printer to increase the printing speed without changing its given mechanical configuration.
  • the invention will be described as applied to a specific embodiment of a dot matrix printer, but it will be recognized by those skilled in the art that the invention is not so limited.
  • FIG. 1 A preferred embodiment of the dot matrix printer apparatus is shown in FIG. 1.
  • the paper or media 1 to be marked by the printer is shown together with a suitable platen 2 and a paper motion tractor or driver means 3 for moving paper 1 in the general direction of the arrow shown.
  • An appropriate ribbon 4 is interposed in front of the paper 1 and may be supported and driven by conventional means not shown in FIG. 1.
  • a movable band or belt 5 is interposed in front of the ribbon 4 in a position separated from both the paper 1 and ribbon 4 and adjacent to, but separate from, a bank of one or more impact hammers 6.
  • the belt or band 5 may contain one or more print element dot forming means. These are generally shown as a movable or flexible finger 7 integrally formed with belt 5 and carry an anvil or impact face 8 on its back side and a print element 10 (see FIG. 2) on the side facing paper 1. The side of finger 7 (and of print element 10 and anvil 8) facing paper 1 is not shown in FIG. 1. However, it will be understood to contain (see FIG.
  • a raised projection or print element 10 in the appropriate plan or form to provide a dot of the desired shape on paper 1 when anvil 8 is struck by one of the hammers 6 to deflect the finger 7 and impact the print element against the ribbon 4 and paper 1.
  • a plurality of timing marks or slots 9 are provided on band 5. As is known in the art, either optically transparent slots or magnetically or mechanically sensible marks may be made on belt or band 5 to appropriately time the motion of the belt 5 past the hammer array 6.
  • print hammers 6 For maximum throughput, it is desirable that there be as many print hammers 6 as there are print element fingers 7 across the length of the print line on paper 1. For a printing operation at appropriate positions across the length of the print line, the individual hammer actuators 6 are caused to operate to impact the anvil surfaces 8. When all of the desired print positions along the print line have been provided and each of the print hammers has been fired at the appropriate number of times and places to create the dots, paper 1 will be stepped in the direction perpendicular to band 5 to the next desired row position and the printing operation will be repeated. Depending on the font of the characters, seven rows of linear dot patterns or more constitute a character line.
  • the time to print one row of linear dot patterns is the time in which the band 5 travels across the distance of a font pitch Pf, or an integer multiple of the font pitch.
  • the present invention permits printing in a variable time, and this mode of operation will be described below. First, however, a description of the conventional mode of operation will be presented so that our improved operation can be better understood.
  • the font pitch Pf has a distance covering 120 dot positions. For ten dot positions per character, the font pitch equals 12 characters wide. Should hammers of the same 12 character width be used, there is a possibility that one hammer can strike two print elements at the same time, or two hammers strike one print element at the same time. To avoid this possibility, as described in copending application Ser. No. 333,092, rather than using one 12 wide hammer, a pair of two 6 wide hammers are used, as shown in FIG. 2. This means that the print elements 10 can be in front of only the odd numbered hammers 1A, 2A, or only the even numbered hammers 1B, 2B.
  • the odd numbered hammers 1A, 2A are active, the even numbered hammers 1B, 2B are idle or vice versa.
  • the total number of hammers 6' will be 22, each spanning six character positions, in order to print the maximum limit or 132 characters in a line.
  • the belt timing mark 9 of the first print element 10 is pointing at the 9th print position (the 9th character) of the 132-character print line.
  • the 11 print elements 10 are respectively pointing at the 11 positions whose locations in the print line are ##EQU1## Since the first print element 10 is at the 93rd position of the total of 1320 dot positions, the pointer is incremented by 3 from 90. (90 is the first column position of the 9th character, because each character is 10 dots wide). Thus, an address is generated to access the actual column or vertical slice of the image data 25 to be printed.
  • This address reads the vertical column of the image data to a register 27, and a row counter and selector 28 select the appropriate row of that column.
  • the first hammer is idle, if the bit selected from this row is "zero" and is activated to strike if the bit selected is "one". In the example shown in FIG. 3, for row 0 the first hammer is set for actuation by setting a 1 bit in hammer shift register 32.
  • the above description tells how the control circuits select a bit from the image data to control the first hammer.
  • the control circuits select one image bit from the same row of the respective 11 columns (pointed at by the 11 print elements) to form an 11 bit word.
  • the control circuits select another 11 bit word to print at the next 11 dot positions by accessing the image data for columns 92, 212, 332, 452, etc.
  • the characteristic of the printer when operating under the conventional control is constant speed printing. Even if there is only one dot to print in the whole row, the control circuits still go through the control algorithm for all the 120 words. The printing speed for one row of dot patterns is constant regardless of the initial position I of the print elements.
  • VSP variable speed printing
  • the variable speed printing will do exactly this to save (120-T) 500 microseconds for each font pitch.
  • the VSP has the following characteristics which are not found in the conventional mode of operation.
  • variable speed adaptor is designed essentially to find the last non-zero column scan in Eq. (A).
  • the VSP principle can be implemented in a manner which takes advantage of the difference in operating speed between electronic operations and electro-mechanical operations.
  • the VSP adaptor takes about 11 microseconds to select the first column scan from the columns at P(I,1,n), n-1, 11, and stores it in an output register.
  • this data cannot be utilized by the print hammers until a time span of 500 microseconds has elapsed. At the end of the 500 microseconds, this column scan data is latched to the 11 hammers.
  • the adaptor can generate 44 more column scans.
  • a monitoring means is set to a number equal to the number of hammer actuations required to print an entire dot line, or 120 in the specific example.
  • the data is sensed as described above for the conventional operation for the data to be printed in columns 93, 213, 333, 453, 573, 693, 813, 933, 1053, 1173 and 1293, and this 11-bit data word is latched to activate the appropriate hammers, and the number in the monitoring means is changed by one.
  • the forward scan control circuits must wait for the hammers to execute this data and this takes about a 500 microsecond waiting time.
  • the first series of backward COLUMN SCANS are executed starting at the last print position for each print element or at addresses 94, 214, 334, 454, 574, 694, 814, 934, 1052, 1172, and 1294.
  • the number in the monitoring means is changed by one. Since the backward scans take place at electronic speed (11 microseconds in the specific example), a large number (44 in the specific example) can be executed within the manner execution waiting time.
  • the VSP circuits scan the data from column positions 94, etc. (11 columns) back to 18, 138, etc. (11 columns) during the waiting time between selecting the hammers to be actuated and the actual printing of this data.
  • the column data at columns 92, 212, 332, 452, etc. (11 columns) is accessed and sent to actuate the hammers.
  • the second series of backward scans of the print image data can be made for columns 19, 139, etc. (11 columns) back to 182, etc. (11 columns).
  • the third forward scan accesses the data for columns 91, 211, 331, etc. (11 columns) and sends this to the hammers.
  • the third series of backward scans can be made for columns 63, 183, etc. (11 columns) back to 94, 214, etc. (11 columns).
  • the third forward scan the entire line of image data has been accessed and the number then in the monitoring means specifies the number of columns of data still to be printed.
  • the number in the monitoring means is changed one for each column accessed and printed.
  • the end of the dot print line is signalled and a paper advance signal is also generated.
  • control circuits for operating the printer are not shown in detail. It is well known in the band and hammer style of printer to provide optical or other sources of indicia on the moving band such as timing marks 9 which can generate emitter output pulses for timing hammer impacts. It is only necessary to count some number of these pulses starting from an initial home position in order to determine whether the hammers are appropriately positioned for firing. Circuitry of this type is known and employed in printers of this style. Therefore, the details of this circuitry and the timing are not shown since they do not form a specific part of the present invention and are quite obvious to those of ordinary skill in this art.
  • a row scan latch 20 is set by the signal START ROW which is generated by the normal control circuits of the printer (not shown).
  • the output of latch 20 is the signal ROW SCAN.
  • the signals ROW SCAN and BELT TIMING (from timing marks 9 on belt 5) are coupled as inputs to Forward Scan Logic 22.
  • Forward Scan Logic 22 generates addressing signals for the specific column scans (i.e., one for each of 11 hammers) to be performed in accordance with Eq. (A).
  • the address signals are coupled sequentially through OR circuit 24 to access the column scan data from Print Line Image Buffer 26.
  • Buffer 26 is a random access memory (RAM) which stores the image data for one print line.
  • RAM random access memory
  • Each address from Forward Scan Logic 22 causes the designated byte to be read out from Buffer 26 to Select Register 28.
  • a gating signal ROW NUM 0-7 is coupled to register 28.
  • the ROW NUM 0-7 signal is generated by the row counter (not shown) to designate the specific one of the 8 rows of the characters within the print line which is currently being printed.
  • the corresponding bit 0-7 of register 28 is gated through AND circuit 30 to set the appropriate bit within Hammer Shift Register 32 when the signal FWD SCAN is up to condition AND circuit 30.
  • the signal FWD SCAN is generated by the Forward Scan Logic 22 as the output of latch 74 (FIG. 6).
  • Latch 74 is set in response to conditioning AND circuit 76 by the signals BELT TIMING and BACK SCAN.
  • the 11 hammer fire signals are stored in shift register 32. These signals are latched for control of the hammers 6 at the appropriate timing to produce a dot at the appropriate place within the print row.
  • the signal SCAN DONE is generated by Forward Scan Logic 22 after all 11 column data has been accessed.
  • the signal SCAN DONE is generated by the presence to condition AND circuit 78 (FIG. 6) of the signals SD CTR and FWD SCAN.
  • the signal SD CTR is generated in response to a counter (not shown) reaching a count equal to the number of column data to be accessed (11 in the specific example).
  • AND circuit 36 is conditioned when the SCAN DONE signal comes up to produce a signal through OR circuit 38 to the DECREMENT input of counter 40.
  • Counter 40 is a count down counter which is preset in response to the START ROW signal to a value equal to the number of column scans required to print a row which is 120 in the specific example being considered.
  • AND circuit 36 is conditioned to decrement counter 40 by one count by a signal coupled on line 42 to the DECREMENT input of the counter 40.
  • the signal SCAN BACKWARD is generated as the output of Scan Backward Latch 34 in response to the signal START ROW and the output signal SCAN BACKWARD is coupled as one input to AND circuit 44.
  • the other input comprises the signal SCAN DONE coupled through INVERTER 46 so that AND 44 is conditioned when the signal SCAN DONE goes down.
  • the conditioning of AND circuit 44 generates a signal which energizes Backward Scan Logic 48.
  • Backward Scan Logic 48 generates the addresses for sequential column scans, starting at the last print position for each of the hammers, i.e., print position 120 in the specific example.
  • the address signals are coupled through OR circuit 24 to Buffer 26 to read out the character data for the selected column to selector register 28.
  • the data is coupled over line 50 to provide one input to AND circuit 52.
  • the other input to AND circuit 52 is provided by the signal BACK SCAN which is generated by Backward Scan Logic 48.
  • the signal BACK SCAN is generated by coupling the output of AND circuit 45 to set latch 70 (FIG. 7).
  • the BACK SCAN signal is up until the number of memory cycles have been generated to access all 11 columns of data at which time the signal SD CTR goes up to condition AND circuit 72 and reset latch 70 so that signal BACK SCAN DONE is generated. Should there be a 1 bit within the data, AND circuit 52 would be conditioned thereby to produce an output which is coupled to set Trigger 54. Trigger 54 generates an output signal NON ZERO WORD which is coupled to the reset input of Latch 34 so that the signal SCAN BACKWARD would come to a down level.
  • the signal BACK SCAN DONE from Backward Scan Logic 48 comes up to condition AND circuit 56 and OR circuit 38 to provide a signal to the DECREMENT input of counter 40.
  • This operation continues from the last print position sequentially in a backward scan toward the first print position, i.e., 120, 119, 118 . . . until one of two conditions occurs.
  • Trigger 54 is set which causes Latch 34 to be reset so that the signal SCAN BACKWARD goes down. This deconditions AND circuit 44 so that no further backward scans occur.
  • the printer continues in the conventional forward scan mode a number of column scans equal to the count remaining in counter 40 since decrementing the count in counter 40 to zero generates the signal ROW COMPLETE.
  • latch 20 and trigger 54 are reset and the appropriate vertical positioning signal is coupled to feed means 3 to produce the desired row spacing.
  • the second alternative is that the backward scans continue until the number of backward scans that can be executed within the available time is reached.
  • the END SCAN signal comes up to decondition AND circuit 45 so that the signal BACK SCAN goes down and a further forward scan can be executed as previously described.
  • the BACK SCAN signal is down so that trigger 54 is not affected by the forward scan data.
  • the operation continues in this manner in a combined forward/backward scan of the print data with counter 40 being decremented one count for each forward scan completed.
  • the counter 40 is decremented one count for each zero word sensed in the backward scan prior to the time a non-zero word is sensed.
  • the signal ROW COMPLETE is generated as described above.
  • FIG. 5 An alternate embodiment for the VSP adaptor is shown in FIG. 5 in which a 120 bit random access memory (RAM) is provided in the adaptor to record the states of the 120 column scans.
  • the state of a column scan is one if any one of the 11 bits in the column scan is non-zero.
  • the state of a column scan is zero if all 11 bits of the column scan are zero.
  • RAM random access memory
  • the states of these 44 column scans are stored in the RAM 60 at the 76th bit to the 33rd bit.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Ink Jet (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Record Information Processing For Printing (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Electronic Switches (AREA)
  • Color, Gradation (AREA)
  • Impact Printers (AREA)
US06/394,054 1982-06-30 1982-06-30 Variable speed printing for dot matrix printers Expired - Lifetime US4448123A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US06/394,054 US4448123A (en) 1982-06-30 1982-06-30 Variable speed printing for dot matrix printers
EP83100690A EP0097757B1 (en) 1982-06-30 1983-01-26 Dot matrix printing apparatus
AT83100690T ATE33466T1 (de) 1982-06-30 1983-01-26 Punktmatrixdrucker.
DE8383100690T DE3376258D1 (en) 1982-06-30 1983-01-26 Dot matrix printing apparatus
ZA831056A ZA831056B (en) 1982-06-30 1983-02-16 Dot matrix printing apparatus
IE368/83A IE54176B1 (en) 1982-06-30 1983-02-22 Dot matrix printing apparatus
CA000425599A CA1186946A (en) 1982-06-30 1983-04-11 Variable speed printing for dot matrix printers
JP58068529A JPS599064A (ja) 1982-06-30 1983-04-20 ドツトマトリツクスプリンタ
AU13851/83A AU558569B2 (en) 1982-06-30 1983-04-21 Variable speed dot matrix printer
ES522306A ES522306A0 (es) 1982-06-30 1983-05-12 Una impresora por matriz de puntos.
BR8303231A BR8303231A (pt) 1982-06-30 1983-06-17 Impressora de matriz de pontos com impressao em velocidade variavel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/394,054 US4448123A (en) 1982-06-30 1982-06-30 Variable speed printing for dot matrix printers

Publications (1)

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US4448123A true US4448123A (en) 1984-05-15

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Application Number Title Priority Date Filing Date
US06/394,054 Expired - Lifetime US4448123A (en) 1982-06-30 1982-06-30 Variable speed printing for dot matrix printers

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US (1) US4448123A (enrdf_load_stackoverflow)
EP (1) EP0097757B1 (enrdf_load_stackoverflow)
JP (1) JPS599064A (enrdf_load_stackoverflow)
AT (1) ATE33466T1 (enrdf_load_stackoverflow)
AU (1) AU558569B2 (enrdf_load_stackoverflow)
BR (1) BR8303231A (enrdf_load_stackoverflow)
CA (1) CA1186946A (enrdf_load_stackoverflow)
DE (1) DE3376258D1 (enrdf_load_stackoverflow)
ES (1) ES522306A0 (enrdf_load_stackoverflow)
IE (1) IE54176B1 (enrdf_load_stackoverflow)
ZA (1) ZA831056B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4487121A (en) * 1984-01-30 1984-12-11 International Business Machines Corporation Fault protection system for a line printer
EP0367059A3 (en) * 1988-10-31 1990-09-12 International Business Machines Corporation Wire fire control mechanism for a wire matrix printer
US20020195010A1 (en) * 1999-05-25 2002-12-26 Kenji Ozawa Motor control method and apparatus, time recorder having same and impact type printing apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6844347B2 (ja) 2017-03-15 2021-03-17 株式会社リコー レーザ処理装置

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US3161126A (en) * 1961-01-12 1964-12-15 Ibm Variable cycle length in chain printer operation
US3289576A (en) * 1964-12-02 1966-12-06 Ibm High speed printer with variable cycle control
US3303775A (en) * 1963-09-20 1967-02-14 Ibm Variable speed printer apparatus and type carrier device therefor
US3827357A (en) * 1973-09-12 1974-08-06 Sperry Rand Corp On-the-fly printer with shortened print cycle
EP0036970A2 (en) * 1980-03-31 1981-10-07 International Business Machines Corporation Dot matrix printing apparatus
US4399748A (en) * 1981-12-21 1983-08-23 International Business Machines Corp. Multiplexed hammer dot band matrix printer

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Publication number Priority date Publication date Assignee Title
US3921517A (en) * 1974-06-21 1975-11-25 Ibm Random firing of multiple width print hammers
DE2432499A1 (de) * 1974-07-04 1976-01-22 Siemens Ag Mechanischer drucker
GB1470283A (en) * 1975-09-02 1977-04-14 Itt Creed Selective printing device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3161126A (en) * 1961-01-12 1964-12-15 Ibm Variable cycle length in chain printer operation
US3303775A (en) * 1963-09-20 1967-02-14 Ibm Variable speed printer apparatus and type carrier device therefor
US3289576A (en) * 1964-12-02 1966-12-06 Ibm High speed printer with variable cycle control
US3827357A (en) * 1973-09-12 1974-08-06 Sperry Rand Corp On-the-fly printer with shortened print cycle
EP0036970A2 (en) * 1980-03-31 1981-10-07 International Business Machines Corporation Dot matrix printing apparatus
US4399748A (en) * 1981-12-21 1983-08-23 International Business Machines Corp. Multiplexed hammer dot band matrix printer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4487121A (en) * 1984-01-30 1984-12-11 International Business Machines Corporation Fault protection system for a line printer
EP0367059A3 (en) * 1988-10-31 1990-09-12 International Business Machines Corporation Wire fire control mechanism for a wire matrix printer
US20020195010A1 (en) * 1999-05-25 2002-12-26 Kenji Ozawa Motor control method and apparatus, time recorder having same and impact type printing apparatus
US6857799B2 (en) * 1999-05-25 2005-02-22 Seiko Precision Inc. Motor control method and apparatus, time recorder having same and impact type printing apparatus

Also Published As

Publication number Publication date
JPS599064A (ja) 1984-01-18
IE54176B1 (en) 1989-07-05
DE3376258D1 (en) 1988-05-19
AU1385183A (en) 1984-01-05
CA1186946A (en) 1985-05-14
AU558569B2 (en) 1987-02-05
BR8303231A (pt) 1984-01-31
ES8404246A1 (es) 1984-04-16
EP0097757B1 (en) 1988-04-13
ES522306A0 (es) 1984-04-16
JPH0326655B2 (enrdf_load_stackoverflow) 1991-04-11
EP0097757A2 (en) 1984-01-11
ATE33466T1 (de) 1988-04-15
ZA831056B (en) 1984-02-29
IE830368L (en) 1983-12-30
EP0097757A3 (en) 1984-12-05

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